GTA04: added LIS302 to board file

based on patch submitted on http://lists.goldelico.com/pipermail/gta04-owner/2014-May/005641.html

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
GTA04A3 board file: fixed missing defines for LIS302 GPIOs
improved compilation and code (check for gpio presence)

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Config: made LIS302 compiled into the kernel

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>